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Find the line voltage VYR when only T3 and T4 are conducting? Consider a star connected balanced R load.

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in Power Electronics by (27.1k points)
Find the line voltage VYR when only T3 and T4 are conducting? Consider a star connected balanced R load.

(a) 2Vs/3

(b) Vs/2

(c) Vs

(d) –Vs

This question was posed to me in a national level competition.

Query is from 3-Phase Bridge Inverters-3 in portion Inverters of Power Electronics

1 Answer

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by (45.1k points)
The correct choice is (c) Vs

To elaborate: When T3 and T4 are conducting, R phase is connected to the negative bus through the T4 SCR and the Y phase is connected to the positive bus through the T3 SCR. Considering that the load is a balanced R load.

VYN = Vs/2

VRN = -Vs/2.

VYR = VYN – VRN = Vs.

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